Burner nozzle tip

ABSTRACT

A fuel burner is provided in which the nozzle tip is formed with a frustoconical end wall integrally connected to a cylindrical outer wall and the walls have a common central axis. The outer walls are formed with a series of orifices which comprise equally spaced apart rows of orifices, positioned in straight lines that are parallel to the central axis of the walls.

I United States Patent 13,592,s75

[72] Inventors Kurt S- Jaeger [56] References Cited UNITED STATESPATENTS 2 App NO gzi 'g 2.61 3,731 10/1952 Schwietert 239/549 x [22]Filed July 25 969 2,840,152 6/1958 Reed 239/549 X [45] Patented July 13,197] Primary Examiner--Carroll B. Dority, Jr. [73] Assignee ForneyEngineering Company Armmeys- John Maier. lll, Marvin A. Naigur and JohnE.

Dallas, Tex. Wilson [54] BURNER NOZZLE TIP 2 3 Drum! ABSTRACT: A fuelburner is provided in which the nozzle tip [52] [1.8. CI 431/114, isformed with a frustoconical end wall integrally connected to 239/549,239/558, 239/559 a cylindrical outer wall and the walls have a commoncentral [5|] Int. Cl F231! axis. The outer walls are formed with aseries of orifices which [50] Field of Search 431/1 14, comprise equallyspaced apart rows of orifices, positioned in straight lines that areparallel to the central axis ofthe walls.

PATENTEU JUL 1 3 ran INVENTORS ROSS FORNEY KURT s JAEGER ATTORNEY FIG. 3

BURNER NOZZLE TIP BACKGROUND OF THE INVENTION In the operation ofpower-generating systems it is important to obtain uniform burning ofthe fuel in is burner section of the steam generator. Accordingly, ithas been common practice to mount a series of burners along theperiphery of the furnace. One of the more common type of burner systemsis the combined oil and gas fired unit in which oil is fed through thecenter of the burner and gas is fed through a coaxial, annular outerchamber. The gas-firing system has presented a problem in that severevibration has been experienced during normal operating conditions. Thisvibration generally occurs close to burner tip, it is possible tocounteract the vibration. It has been found that the outer orifices ofthe present invention result in the ignition point of the gas beingbrought back closer to the surface of the nozzle tip, and the center ofthe flame becomes much richer. Thus, in accordance with the presentinvention a sufficient change occurs in the initial combustion zone ofthe flame to radically change the resonant frequency of the flame andthereby reduce the vibration created by the burner.

SUMMARY OF THE INVENTION In accordance with an illustrative embodimentdemonstrating features and advantages of the present invention, there iswall connected to a cylindrical outer wall. The end wall has a series ofend orifices which have axes that are substantially perpendicular to theplane of the end wall. The outer wall is formed with a series of outerorifices which have axes that are substantially perpendicular to theplane of the outer wall. There is also provided means for introducing acombustible gas to the annular chamber, and means for igniting the gaspassing through the orifices. Thus, the combustion of the gas emergingfrom the end orifices and the outer orifices reduces vibration in fuelburner.

BRIEF DESCRIPTION OF THE DRAWINGS The above brief description, as wellas further objects, features and advantages of the present inventionwill be more fully appreciated by reference to the following detaileddescription of a presently preferred but nonetheless illustrativeembodiment in accordance with the present invention, when taken inconnection with the accompanying drawings wherein:

FIG. I is a perspective view of a gas burner in which the nozzle tip ofthe instant invention is employed;

FIG. 2 is an enlarged elevational view of the nozzle tip removed fromthe burner shown in FIG. 1. with portions being broken away andsectioned to illustrate the axes of the end orifices and outer orificesof the nozzle tip; and

FIG. 3 is an enlarged elevational view of a portion of the burner shownin FIG. i with portions broken away and sectioned to show connection ofthe nozzle tip to the burner.

DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to FIG. 1, inaccordance with the present invention there is provided a fuel burnergenerally designated by the reference numeral which is shown completelyremoved from its operating environment in a vapor generator. For thesake of simplicity the means for introducing a combustible gas into theburner 10 has been shown schematically by an arrow which is designated Gand likewise the means for introducing oil through the center of theburner 10 is shown by an arrow which is designated by the letter 0.Also, the means for igniting the gas, as well as the means for ignitingthe oil, are not directly shown in the drawings, as these are well knownin the art.

The burner 10 includes a cylindrical conduit 12 which is coaxiallymounted in a cylindrical guide tube 14, with a flange port I6 beingconnected in flow communication at the end of the conduit 12 forreceiving the gas 0. An end port 18 is gas G exteriorally drawings.

As best shown in FIG. 3, the conduit [2 includes a cylindrical innerwall 20 spaced apart from an outer wall 22, with walls 20 and 22 beingjoined together by a nozzle tip 24 to form an annular gas chamber 26.The nozzle tip 24 includes a frustoconical end wall 28 which isintegrally formed with a cylindrical outer wall 30, and a cylindricalinner wall 32. The walls 30 and 32 are joined together by welds 34,thereby completing the annular gas chamber 26. The inner walls 20 and 32define an inner guide conduit 36 which is connected to the end port 18for passing the oil gun 0 through the burner.

As best shown in FIG. 2, the frustoconical end wall 28 is formed with aseries of end orifices 40 which have axes that are substantiallyperpendicular to the plane of orifices 42 which have axes that aresubstantlally perpendicular to the plane of the outer wall 30. Byreferring to FIG. 2 it can be seen that the axis of outer orifice 42which is designated A-A is not parallel to the axis of end orifice 44which is designated B-B. Accordingly, the angle subtended between axisA-A and B-B, which has been designated 8, is less than The end orifices40 and outer orifices 42 are formed in rows which are designated 50 andare positioned along the outer surface of end wall 28 and outer wall 30,parallel to the central axis of cylindrical conduit 12. Thus, the forceexerted by the combustion of jets of gas, passing through end orifice 40and outer orifice 42, respectively tend to counteract one another.Another factor in reduction of vibration in the radical change in theresonant frequency of the flame of burner 10.

A latitude of modification, change and substitution is intended in theforegoing disclosure and in some instances some features of theinvention will be employed without a corresponding use of otherfeatures. Accordingly, it is appropriate that the appended claims beconstrued broadly and in a manner consistent with the spirit and scopeof the invention herein.

We claim:

I. A fuel burner capable of combusting a fuel comprising a conduitincluding an inner tube wall and spaced apart essentially uniform outertube wall joined together at a tip section section including afrustoconical end wall section integrally connected to a cylindricalwall section, said end wall section having a series of end orificeswhich have axes that are substantially perpendicular to the plane ofsaid end wall section, said cylindrical wall formed with a series ofouter orifices which have axes that are substantially perpendicular tosaid central axis, said end orifices and outer orifices forming rows oforifices including at least one of said end orifices and at least one ofsaid outer orifices and said rows of orifices being positioned instraight lines along the outer surface of said conduit, parallel to saidcentral axis, and said rows of orifices being equally spaced apart alongthe periphery of said conduit and means for introducing said fuel tosaid gas chamber, such section slopes inwardly from said cylindricalwall section such that an angle is subtended between the centerlines ofthe axes of the end orifice and outer orifice in each of said rows whichis less than

1. A fuel burner capable of combusting a fuel comprising a conduitincluding an inner tube wall and spaced apArt essentially uniform outertube wall joined together at a tip section to form an annular gaschamber having a central axis, said tip section including afrustoconical end wall section integrally connected to a cylindricalwall section, said end wall section having a series of end orificeswhich have axes that are substantially perpendicular to the plane ofsaid end wall section, said cylindrical wall formed with a series ofouter orifices which have axes that are substantially perpendicular tosaid central axis, said end orifices and outer orifices forming rows oforifices including at least one of said end orifices and at least one ofsaid outer orifices and said rows of orifices being positioned instraight lines along the outer surface of said conduit, parallel to saidcentral axis, and said rows of orifices being equally spaced apart alongthe periphery of said conduit and means for introducing said fuel tosaid gas chamber, such that the gas passes through said end orifices andsaid outer orifices whereby jets of ignited gas from said outer orificescounteract the forces created by jets of ignited gas from said endorifices to reduce vibration in said fuel burner.
 2. A fuel burneraccording to claim 1 in which said end wall section slopes inwardly fromsaid cylindrical wall section such that an angle is subtended betweenthe centerlines of the axes of the end orifice and outer orifice in eachof said rows which is less than 90*.